Blight of pears, apples, and quinces
By: [by John W. Roberts]
Contributors: United States. Agricultural Research Service
Series: Leaflet / U.S. Dept. of Agriculture -- no. 187; Leaflet (United States. Dept. of Agriculture) -- no. 187.
Publisher: U.S. Dept. of Agriculture
Published: 1939
Place of publication: Washington, D.C
Language: eng
Subjects: Apples; Diseases and pests; Fire-blight; Pear; Quince
Notes: Cover title.